Worldwide
Big Bang Day
From one tiny point, everything.
When is Big Bang Day?
Every year on March 21.
What is Big Bang Day?
Big Bang Day, first marked in 2013 and inspired by the European Space Agency's all-sky map of the cosmic microwave background, celebrates the discovery that the universe began about 13.8 billion years ago from an extremely hot, dense state. The day honors Georges Lemaître, Edwin Hubble, and generations of cosmologists whose work turned the faint afterglow of creation into one of humanity's most precise measurements.
How to celebrate
Mark the day with a poster made in Dayfeed — pick your favourite photo as the background, share it to your story or group chat, and set a reminder so you never miss it next year.
Hashtags
- #BigBangDay
- #Cosmology
- #CMB
Try it: save this day's poster to your Pinterest board.
This is the Big Bang Day poster, made with Dayfeed. Pin it to your board — no app needed.
Save to Pinterest
In the Dayfeed app
Never miss a special day
Turn this day into a poster.
100 designs, your photo, ready for Instagram.
More in March
All days →
Mar 1Zero Discrimination Day
Mar 1World Compliment Day
Mar 1St. David's Day
Mar 1International Wheelchair Day
Mar 1 – 31National Colon Cancer Awareness Month
Mar 1 – 31Nutrition Month
Mar 1 – 31Expanding Girls' Horizons in Science and Engineering Month
Mar 1 – 6National Aplastic Anemia & MDS Awareness Week
